<div dir="ltr"><div><div>Hi Sepp,<br>I did do a calibration script on a micro CT platform. The idea was that I had a bb taken from 4 different view points at 4 different heights with a known distance. Their projected position was segmented beforehand on the projections and I tried to match the projections by optimizing the calibration (which we see in before.pdf and after.pdf). I don't think it's a good script, e.g., because I tried to find 8 parameters when 7 are sufficient for my system (see, e.g., <a href="http://iopscience.iop.org/article/10.1088/0031-9155/45/11/327/meta;jsessionid=8DD0F1160098FBC65BB161A0257FBA75.c3.iopscience.cld.iop.org#">this paper</a>). But this gives you a starting point to develop your own script which will hopefully be better. Please share if you do something from it!<br></div>Thanks,<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Nov 19, 2016 at 8:51 PM, Sepp de Raedt <span dir="ltr"><<a href="mailto:sdr@nrtxray.com" target="_blank">sdr@nrtxray.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi RTK users,<br>
<br>
I'm interested in reconstructing images acquired by a fluoroscopy system rotating around a knee phantom. Unfortunately, I've been unsuccessful so far. I recognize some of the phantom in the reconstructed image, but it contains double contours and the shape is deformed.<br>
<br>
I think the issue might be incorrect geometry specification. I have images also including a phantom containing markers for which we know the coordinates, which should allow us to calibrate the system. On the wiki on image quality, I saw that some users had developed scripts to do the calibration? Would someone be willing to share it?<br>
<br>
Kind regards,<br>
Sepp<br>
<br>
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